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TM 9-2320-364-20-3
2-2336
7. LOSS OF HOOK ARM SAFE LOWERING FUNCTION (CONT).
6.
Is continuity measured at
hook arm safe lowering
button wire connection points
with button pushed in?
Replace hook arm
safe lowering button
(Para 7-41).
Verify repair, go to
Step 9 of this Fault.
YES
NO
Hook arm operates in manual
mode.
Middle frame operates in
manual mode.
Wire 1470 OK.
Wire 1475 OK.
Wire 1435 OK.
Hook arm safe lowering button
faulty.
Wire 1479 faulty.
Wire 1477 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If hook arm safe lowering button
is faulty, 22 to 28 vdc will not be
present at safe lowering valves.
WARNING
7.
Are 22 to 28 vdc measured on
wire 1479 at middle frame
safe lowering button with
ENGINE switch in the ON
position?
Repair wire 1479
(see schematic
Fig 2-52) or notify
DS Maintenance.
Verify repair, go to
Step 9 of this Fault.
YES
NO
Hook arm operates in manual
mode.
Middle frame operates in
manual mode.
Wire 1470 OK.
Wire 1475 OK.
Wire 1435 OK.
Hook arm safe lowering button
OK.
Wire 1479 faulty.
Wire 1477 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If wire 1479 is loose, faulty, or
shorted to ground, 22 to 28 vdc
will not be present at middle
frame safe lowering button.
WARNING
Read WARNING
on Page 2-2337
Read WARNING
on Page 2-2337
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